Frank Jost, 25, was working at a Staten Island EMT station Wednesday night filling in for another medic, when a call for a man with a severed arm after being hit by a train came over the radio.

“Once I heard limb on the radio, I thought: ICE. HOSPITAL. GO!” Jost told The Post.

He and other first responders rushed to the scene near the Pleasant Plains train station at about 10:40 p.m. He knew that the limb had to be packed in ice, and he knew the closest place to the station to get some was a bar called Hot Shotz.

“I live in that neighborhood so I know there is a bar next to the station and I know how far the hospital is so I requested a bag of ice,” he said.

Jost said he told other EMTs to go to the bar and get the ice while he got a bag and went to the tracks to get the arm.